import sys
from PyQt5.QtWidgets import QMainWindow,QApplication

class Example(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.statusBar().showMessage('Ready')
        self.setGeometry(300,300,250,150)
        self.setWindowTitle('StatusBar')
        self.show()

if __name__=='__main__':
    app=QApplication(sys.argv)
    ex=Example()
    sys.exit(app.exec_())

